Having seen a glimpse of his father's memories, Eren attempts to track down a man hoping they might shed some light on his father's secrets.
All he's done is hardening 
experiments lately.
.لم يفعل شيئًا سوى خوض تجارب التّصلّب مؤخّرًا
In letzter Zeit haben wir pausenlos
Versuche durchgeführt.
Últimamente experimentó sin cesar.
Últimamente ha experimentado sin cesar.
Son entraînement
a sans doute été trop intensif.
Di recente sta facendo
un esperimento dietro l'altro.
Ele só tem feito experimentos
de endurecimento.
Он же постоянно участвует в опытах.